期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 24, 页码 13366-13371出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202100917
关键词
layered cathodes; pinning effect; sodium-ion batteries; structural stability; zero strain
资金
- National Natural Science Foundation of China [22075132, 51802149, U1801251, 11874199]
- Fundamental Research Funds for the Central Universities
- International Cooperation and Exchange Program by NSFC [11911530174]
Layered oxides as cathode materials for sodium-ion batteries are being explored for their high capacity and flexible composition. The introduction of Fe3+-pinned Na sites has shown to inhibit slab sliding, resulting in exceptional cycle performance and high rate capability in Na storage layered cathodes.
Layered oxides as the cathode materials of sodium-ion batteries are receiving extensive attention due to their high capacity and flexible composition. However, the layered cathode tends to be thermodynamically and electrochemically unstable during (de)sodiation. Herein, we propose the pinning effect and controllable pinning point in sodium storage layered cathodes to enhance the structural stability and achieve optimal electrochemical performance. 0 %, 2.5 % and 7.3 % transition-metal occupancies in Na-site as pinning points are obtained in Na0.67Mn0.5Co0.5-xFexO2. 2.5 % Na-site pinned by Fe3+ is beneficial to restrain the potential slab sliding and enhance the structural stability, resulting in an ultra-low volume variation of 0.6 % and maintaining the smooth two-dimensional channel for Na-ion transfer. The Na0.67Mn0.5Co0.4Fe0.1O2 cathode with the optimal Fe3+ pinning delivers outstanding cycle performance of over 1000 cycles and superior rate capability up to 10 C.
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